如何将选区存储为alpha通道

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select * from tbl_Articles WHERE ArticleID=956412 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=956412 LIMIT 0,1
select * from tbl_Articles_sphinx where id=956412 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(2126188,1350704,1648407,1481703,809795,1538503,1067729,663836,1079426,372241,2700803,482375,1066694,2838421,1079728,1076135,1122729,851940,2490113,155807,2214389,1127905,2167391,2548125,1631986,2548569,937415,208222,1509137,2502038) ORDER BY field (ArticleID,2126188,1350704,1648407,1481703,809795,1538503,1067729,663836,1079426,372241,2700803,482375,1066694,2838421,1079728,1076135,1122729,851940,2490113,155807,2214389,1127905,2167391,2548125,1631986,2548569,937415,208222,1509137,2502038)